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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-2618] Attempting to create a new index that already exists with diff option fails silently</title>
                <link>https://jira.mongodb.org/browse/SERVER-2618</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;if calling createIndex on already existing index, but with different options (like unique), no error is raised but index is not changed&lt;/p&gt;

&lt;p&gt;At the end of following, the index is not unique:&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;foo:PRIMARY&amp;gt; db.test2.createIndex({c:1})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;foo:PRIMARY&amp;gt; db.test2.createIndex({c:1}, {unique: true})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;foo:PRIMARY&amp;gt; db.system.indexes.find()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;_id&quot; : ObjectId(&quot;4d65b40cb91238df65f3e841&quot;), &quot;ns&quot; : &quot;mydb.test2&quot;, &quot;key&quot; : { &quot;c&quot; : 1 }, &quot;name&quot; : &quot;c_1&quot;, &quot;v&quot; : 0 }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="14867">SERVER-2618</key>
            <summary>Attempting to create a new index that already exists with diff option fails silently</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="antoine">Antoine Girbal</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 Feb 2011 01:33:03 +0000</created>
                <updated>Tue, 12 Jul 2016 00:17:46 +0000</updated>
                            <resolved>Mon, 17 Jun 2013 15:57:44 +0000</resolved>
                                                    <fixVersion>2.5.1</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>5</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="480678" author="singlet" created="Sat, 11 Jan 2014 17:15:04 +0000"  >&lt;p&gt;In pymongo 2.6.3 this bug still exists. That&apos;s pretty annoying for novice in mongodb, because bug looks like it can be corrected with a simple condition checking.&lt;/p&gt;</comment>
                            <comment id="361928" author="scotthernandez" created="Mon, 17 Jun 2013 17:16:44 +0000"  >&lt;p&gt;This is backwards breaking because before an error wasn&apos;t generated, and now they will be.&lt;/p&gt;</comment>
                            <comment id="361867" author="auto" created="Mon, 17 Jun 2013 15:57:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2618&quot; title=&quot;Attempting to create a new index that already exists with diff option fails silently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2618&quot;&gt;&lt;del&gt;SERVER-2618&lt;/del&gt;&lt;/a&gt; Attempting to create a new index that already exists with diff option fails silently&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a2056afecf016c4798cd16f594c719ce6e893196&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a2056afecf016c4798cd16f594c719ce6e893196&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="177822" author="woaksie" created="Mon, 22 Oct 2012 16:29:38 +0000"  >&lt;p&gt;Also happens when you try an create a TTL index on a field that already has an index.&lt;/p&gt;</comment>
                            <comment id="174628" author="tad" created="Sun, 14 Oct 2012 16:34:23 +0000"  >&lt;p&gt;I think that we should fail any request to &quot;create&quot; an existing index with different settings than the existing one.  The error code and message should be explicit about the  problem, for example:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ err : &quot;Cannot create index &apos;myNewIndex&apos;, index exists with different attributes&quot;, code : &amp;lt;new code&amp;gt;, ok : 0.0 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;If we wanted (in a separate ticket) to add a feature to convert an index on-the-fly, that might have some value, but since the workaround is to drop the current index and create a new one with the desired settings, all we really need here is to return an error.&lt;/p&gt;</comment>
                            <comment id="174545" author="dblock" created="Sat, 13 Oct 2012 17:02:13 +0000"  >&lt;p&gt;For what it&apos;s worth, it took me half a day to narrow a problem to this one - we were &quot;sure&quot; that we have a unique index on something and were still seeing dup data.&lt;/p&gt;</comment>
                            <comment id="114869" author="rstam" created="Mon, 30 Apr 2012 16:00:41 +0000"  >&lt;p&gt;Craig and I recently went back and forth many times with a user who was complaining that his unique index wasn&apos;t working only to finally find out that his calls to createIndex with &lt;/p&gt;
{unique:true}
&lt;p&gt; we&apos;re being silently ignored because of a pre-existing index that was not unique.&lt;/p&gt;

&lt;p&gt;I&apos;m not sure what the second call to createIndex should do (recreate the index or give an error message), but silently doing nothing is definitely not the right thing.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="15026">SERVER-2699</issuekey>
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